.picbook
  position absolute
  width 100%
  height 100%
  z-index 98
  .main
    position absolute
    width 100%
    height 100%
    z-index 98
  .back
    background url($urlTitle + 'icon/icon-返回.png') 0 0 / 100% 100%
    transform translate(calc(0px - var(--X)), calc(0px - var(--Y)))
    $coord('WHLT', 3.25rem, 3.1rem, 2rem, 1rem)
    z-index 99
  .swiper
    position fixed
    width 100%
    height 100%